Self-contained oscillator tube



E. KARFLUS `Fuly 4, 1933.

SELF CONTAINED OSCILLATOR TUBE Filed Dec. 9, 1929 y GV,

Patented July 1933i UNIT-lso stairs PATE Nr rica EDUARD Martos, or nn'nLiN-T'nivrrntrror; GERMANY, Assieiioie 'ro o. inoaENz AKTIENGESELLSCHAFT', or isnntr'iimnifirrrtnor, GERMANY SELF-CONTLENED GSCILLATOR TUBE- Application filed December 9, 1929, Serial No. 412,647, land in Germany January 8, 1929. i

For the production of short? waves,par ticularly ultra-short wavesit has 'been suggested to arrange the oscillatory circuits between the electrodes within the tube, in order to reduce them to such an extent, that the required short waves may be produced. -As is known the oscillatory circuits will shrink together to short connectionsv between the various electrodes during the production of said choke coils can be arranged only with K diftlculty externally ot the'tube, Vand on the 2 other hand the pointof connection of the chokeicoils,'which naturally must be as close as possible to the point of supply `of current in the oscillatory circuit, remains at a greater distance from the oscillatoryy circuit, since the oscillatory circuits for constructional reasons must possess a certaindistance from the glass wall of the tube. These connections between the point of connection of the supply of voltage and the beginningof the choke coil under circumstances may be subjected to l oscillations of their own and thus act on the entire oscillation proceedings in a mannerA ,notdesiredy n Y y The inconveniences referred to may be avoided in that the voltage requisite for the working is supplied by ,way of the choke coils, carried by the supports fused Vinto the glass base. By this means'the choke coils are located-insideot the tube and on the 40 Vother hand the point of supply of the voltage is almost united with the end of the choke coils.

A mode of -execution of the device accord- -v -ing tothe invention is shown is in the drawming by way of example. c

Figure 1 shows a tube according to the invention and .v

Figure 2 is a modified form thereof in elefvation. In the example shown in Figure l two glass waves having a length of a few centimetres. 1 In order to withhold the high frequency tromy rods Tll and T2 are'iused to the glass stem F. Thesaid rods carry two choke coils Drl and. Drz, which serve for supplying the grid volttage and the anode pressure respectively. At the ,ends ofthe choke coils towards the oscillatory side are arranged the anode A and the grid 'Gr respectively. By a corresponding constructiona'l formation of the end ot the,

choke coil it is possible, that both the grid and the yanode are directly carried by the said choke coils or their glass rods respectively. In this manner the provision of spe- I cialsupports :tor the electrodes can be dispensed with. The heating wire H is carried in the example shown in Figure l by support-` ing elements as such are customary in the manufacture of tubes of this kind, while in thefexample illustrated in Figure 2V also in the heating circuit choke coils Dr3 on rods T3 respectively areari'anged.

The supply of the voltages proper is eectedbyA way'ot plug-pins Sil to Sti secured in known'manner to the base S1 of the tube. The oscillations of high Jfrequency produced are passed by way ot outgoing leads S and Sin the glass wall to an antenna D. In the centre of said antenna a capacity C may be inserted, which maybe formed for instancel by la small metal pipe and a pin having an intermediate layer of mica. In the modication illustrated in Figure 2 there is likewise provided at the upper end ofthe tube a baseS2,carrying plug pins St andSe-,to which the circuit of the antenna may be connected. Y .y Y p f By the separation of the supply circuits repcom resented inthe examples on the one hand,

which are connected by way of pins Sil to Str,

and the useful circuit onthe otherfhand, a complete separation of 'the circuits having a low frequency or being under continuous curient respectively from the circuits of the highest frequency is eiected. Just this separation is of the highest importance in the production of ultra-short waves, since the reactions of the circuits upon each other might easily cause disturbances and they will intertere with the production of short waves at all.

By forming the connection points of the antenna into plug-pins of known type as represented in Figure 2, it is possible to easily exchange the tube. This is a requirement,

which may be of importance, for instance, in duplex transmission, where a certa-in secrecy 5 is required.

It is thus possible for instance to fit a main transmitting apparatus with a plurality of such tubes, which are exchanged each time, when the main transmitting apparatus is in touch with another station of a plurality of stations. The rest of the smaller stations will then not be in the position to listen to the message, since it is impossible on account of the minuteness of the waves to adjust the apparatus to the wave-length requisite for listening to the message without constructional changes in the tube proper. By the arrangement of the capacity of the antenna merely a slight alteration of the wave length can be effected, which lies within the limits determined by differences in the production of the tubes. If however, in principle different tubes are employed for the transmission of messages between two stations, that is to say if their electrodes or the leads of the electrodes are chosen of different size, it is impossible for a third station to share in the' transmission.

Tubes according to this invention may for instance very easily be employed with reflecting arrangements, such as mirrors and the like, in that the base Slis yintroduced into a socket secured to the mirror while the antenna is secured to the pins Sts, Stg. In this instance the height of the tube will determine 'the distance of the antenna from its reflecting surface. In this manner an exceedingly simple device is obtained, having only a few separate parts.

I claim:

l. An electronic tube comprising a plurality of electrodes within an envelo e, current supply leads for said electro es, and choke coils within the envelope connected quency output leads connected to two of the electrodeshaving leads in series with choke coils.

2. An electronic tube comprising an en velope, a plurality of electrodes therein, current supply leads for said electrodes', a stem within the envelope provided with inwardly extending supports, high frequency choke coils carried by said supports and connected in series with said electrodes, and high in series with two of said leads and high frefrequency output leads connected to said electrodes.

3. An electronic tube comprising a plurality of electrodes within an envelope, current supply leads for Said electrodes, choke coils within the envelope connected in series with said leads, and high frequency output leads connected to said electrodes, said high frequency and said current supply leads passing through said envelope at opposite extremities thereof.

4. An electronic tube comprising a plurality of electrodes within an envelope, current supply leads for said electrodes, choke coils within the envelope connected in series with two of said leads, and high frequency output leads connected to two of said electrodes, said high frequency leads being connected tothe same electrodes to which the current supply leads containing choke coils are connected.

5. An electronic tube comprising an envelope having terminals at opposite ends thereof, a plurality of electrodes within the envelope, current supply leads connecting the electrodes and the terminals at one end, high frequency output leads connecting the electrodes to the terminals at the other end, and high `frequency choke coils within the envelope connected in series with the current supply leads.

6. An electronic tube comprising an envelope having terminals at opposite ends thereof and containing a cathode, an anode, and a grid, current supply leads connecting the cathode, anode and grid to the terminals at o ne end of the envelo e, high frequency output leads connecting t e anode and grid to the terminals at the other end of the envelope, and a high frequency choke coil within the envelope for each electrode connectedin series with the respective current supply leads.

7. An electronic tube according to claim 6 including a stem within the envelope having inwardly projecting arms fused thereto on which the respective choke coils are wound.

8. An electronic tube according to claim 5 wherein a stem within the envelo e has inwardly projecting arms fused tiereto on which the respective choke coils are wound.

In testimony whereof I have aihxed my signature.

EDUARD KARPLUS. 

